Press and hold Volume Up + End/Power button simultaneously. On some T528 variants, use Volume Down + Power button. Try both if one doesn't work.
Then he remembered a YouTube comment he saw years ago: “For TECNO T528, do the three-finger salute of the brick phone.” How To Hard Reset TECNO T528
The phone booted to the setup wizard. “Welcome! Select language.” Press and hold Volume Up + End/Power button simultaneously
If you have forgotten your password and are locked out of your files, you can use a specific key combination to trigger a reset. On the keypad, type: *#12345# . type: *#12345# .